Risk and Reliability Assessment of Metal Lathe Machining Operation with DBN-FFTA Hybrid Approach

Table 1

Description of intermediate events in metal lathes relevant failure.

Symbol	Intermediate event	Symbol	Intermediate event
IE1	Deficiency of grip chuck	IE15	Gathering of flouncy in grip chuck
IE2	Failure to hold the workpiece	IE16	Loose connections and screws of the upper jaw
IE3	Tool post defect	IE17	Functional defect of the cutting tool
IE4	Defective cooling system	IE18	Defective coolant outlet
IE5	Installation and assembly error of machine components	IE19	Defective cooling pump motor
IE6	Inappropriate performance speed	IE20	Speed control malfunction
IE7	Safety guard error	IE21	Shaking
IE8	Improper feeding rate	IE22	Lock lever not working properly
IE9	Tail stock	IE23	Spindle heating
IE10	Workpiece vibration	IE24	High noise of the spindle
IE11	Insufficient rotation and movement	IE25	Spindle cutting stop
IE12	Not moving supports or Vernier’s	IE26	Incorrect spindle orientation
IE13	Malfunction of the grip chuck key	IE27	Corrosion and tearing of the grater or tool post
IE14	Spindle defect	IE28	Low coolant level